Guild Wars 2

I have neglected the Mordrem Problems achievement and returned to it recently, and with no information on the wiki, nor any entries on the forums with the achievement name in it, I feel I need to consider this a bug.

I have done the event where the 10 charr workers get entwined up on the hill in the Granite Front (north of Viper’s Run waypoint) about a dozen times. Vaguely remember doing it a few times without realising it’s part of the event set before I started neglecting the Iron Marches a good while ago. Still, that one event out of the five required for the achievement remains unchecked.

There seems to be nothing indicating nearby that anything else needs to be done before engaging in rescue.

I have exactly the same problem.
I have finished the part 1,2,4 and 5 but i can’t finish. the part “rescue the captured workers” doesn’t want been validate.

https://forum-en.gw2archive.eu/forum/support/bugs/Mordrem-problems-achievement/first#post6213648
I reported this a few weeks ago, other players are experiencing and posting about it as well, but it is not appearing on the known bugs list.